Marking as sent in redis should include failed messages

[rowanseymour]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 38.46154% with 8 lines in your changes missing coverage. Please review.

Project coverage is 74.48%. Comparing base (0559144) to head (5494cc1).

Files with missing lines	Patch %	Lines
backends/rapidpro/backend.go	38.46%	5 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #799      +/-   ##
==========================================
- Coverage   74.51%   74.48%   -0.04%     
==========================================
  Files         111      111              
  Lines       13448    13440       -8     
==========================================
- Hits        10021    10011      -10     
- Misses       2697     2698       +1     
- Partials      730      731       +1     

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